alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET DELETED Linux/SSHDoor.A User Login CnC Beacon"; flow:established,to_server; content:"sid="; http_uri; content:"|3A|"; http_uri; content:"&uname="; http_uri; reference:url,blog.eset.com/2013/01/24/linux-sshdoor-a-backdoored-ssh-daemon-that-steals-passwords; classtype:command-and-control; sid:2016315; rev:3; metadata:attack_target Client_Endpoint, created_at 2013_01_30, deployment Perimeter, signature_severity Major, tag c2, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)